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FHWA-Central Federal Lands Highway Division

Denver, Colorado

View Accreditation Certificate
Patrick Kowing
1 Denver Federal Center Building 52 Central Fed. Lands Highway Div. Lab Denver , Colorado 80225

Phone: (720) 963-3538 Fax:
Quality Management System - accredited since 3/1/1989
R18, ISO/IEC 17025, C1077 (Aggregate), C1077 (Concrete), D3666 (Aggregate), D3666 (Asphalt Binder), D3666 (Asphalt Mixture), D3666 (Emulsified Asphalt), E329 (Aggregate), E329 (Asphalt Binder), E329 (Asphalt Mixture), E329 (Concrete), E329 (Emulsified Asphalt)

Asphalt Binder - accredited since 3/1/1989
R28, T50, T51, T228, T240, T301, T313, T315, T316, T350, D70, D113, D139, D2872, D4402, D6084, D6648, D7175, D7405

Emulsified Asphalt - accredited since 3/1/1989
T59 / D6930 (Settlement and Storage Stability)
T59 / D6933 (Sieve Test)
T59 / D6934 (Residue by Evaporation)
T59 / D6935 (Cement Mixing)
T59 / D6998 (Aggregate Coating)
T59 / D7402 (Particle Charge)
T59 / D7496 (Saybolt Viscosity at 25°C (77°F))
T59 / D7496 (Saybolt Viscosity at 50°C (122°F))

Asphalt Mixture - accredited since 3/1/1989
R30, R35, R47, T30, T166, T167, T209, T246, T247, T269, T283, T305, T308, T312, T329, T331, D1074, D1075, D1560 (Stability), D1561, D2041, D2726, D3203, D4867, D5444, D6307, D6390, D6752, D6925, D6931

Soil - accredited since 3/1/1989
R58, R74, T89, T90, T99, T100, T180, T190, T265, T267, T288, T289, T311, D421, D698, D854, D1140, D1557, D2216, D2487, D2488, D2844, D2974, D4318, D4643, D4972

Aggregate - accredited since 3/1/1989
R76, R90, T11, T19, T21, T27, T37, T84, T85, T96, T100 (Mineral Filler), T104, T112, T176, T255, T304, T335, C29, C40, C88, C117, C127, C128, C131, C136, C142, C535, C566, C702, C1252, D75, D546, D2419, D4791, D5821

Concrete - accredited since 3/1/1989
M201, R39, R60, T22, T23 (Cylinders), T24, T119, T121, T152, T196, T231 (7000 psi and below), T303, T309, C31 (Cylinders), C39, C42, C138, C143, C172, C173, C192, C231, C511, C597, C617 (7000 psi and below), C805, C1064, C1231 (7000 psi and below), C1260, C1542, C1567

Please note that our accreditations do not include an expiration date. An accreditation only expires when the laboratory fails to comply with our accreditation requirements.

* This information is only valid as of 1/19/2021. Please visit for current accreditation status.